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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be43781b3b8e0415b790d63c51c244bd983d7b0ea62ee7715f54498e970daf1' 
  AND token = 'vi3EYFE7i1EgntuEs/9u97Hoak/nIiFXhZm/cY71EKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}